S-91670A194 8-32 x 1/2" ASTM A574 Left-Hand Threaded Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
• Precise Class 3A thread fit provides superior engagement and vibration resistance in demanding left-hand thread applications.
li>Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish for long-lasting use.
• Rockwell C37 hardness delivers excellent wear resistance and maintains thread integrity through repeated assembly cycles.
• Standard hex socket drive (9/64") allows for secure tool engagement and high torque application in confined spaces.
• Fully threaded design ensures consistent clamping force along the entire 1/2" length for uniform load distribution.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency and environmental safety for global industrial use.

Professional Applications & Engineering Value

This 8-32 UNC left-hand thread socket head cap screw is engineered to address critical needs in machinery and equipment where reverse threading prevents loosening from rotational forces. The black-oxide alloy steel construction combats rust and wear in harsh environments, while the coarse thread spacing and Class 3A fit provide rapid assembly and secure fastening in high-vibration settings like automotive, aerospace, and heavy machinery. Its high tensile strength and fully threaded rod design ensure dependable performance in left-hand threaded components, reducing maintenance downtime and enhancing operational safety.

Specification Summary & Compliance

This screw features a UNC coarse thread with Class 3A tolerance for precise fit, manufactured per ASTM A574 specifications. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free of hazardous substances and suitable for international industrial applications.